linux-kernel - Re: [PATCH v1] x86/power/64: Restore processor state before using per-cpu variables

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Message-ID: <20160812054913.GA24303@nazgul.tnic>
Date:	Fri, 12 Aug 2016 07:49:13 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Thomas Garnier <thgarnie@...gle.com>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	keescook@...omium.org, kernel-hardening@...ts.openwall.com,
	jikos@...nel.org, yinghai@...nel.org
Subject: Re: [PATCH v1] x86/power/64: Restore processor state before using
 per-cpu variables

On Thu, Aug 11, 2016 at 02:49:29PM -0700, Thomas Garnier wrote:
> Restore the processor state before calling any other function to ensure
> per-cpu variables can be used with KASLR memory randomization.
> 
> Tracing functions use per-cpu variables (gs based) and one was called
> just before restoring the processor state fully. It resulted in a double
> fault when both the tracing & the exception handler functions tried to
> use a per-cpu variable.
> 
> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
> ---
> Based on next-20160808

Ok, I believe before I test this, I need to apply another patch from
Rafael. I think it is the "Always create temporary identity mapping
correctly" thing.

Yes, no?

Rafael, can you please apply everything on a test branch for us to run?

Thanks.

-- 
Regards/Gruss,
    Boris.

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